vnet: On rx-mode set, return error for an actual error.
vnet: On rx-mode set, return error for an actual error.

In set_hw_interface_change_rx_mode(), when vnet_hw_if_set_rx_queue_mode()
returns an error it actually returns success.  This has been changed to
return a clib_error_return() value.

Type: fix
Change-Id: Iba39c875d9e15463cb6492d8a966234560a1f522
Signed-off-by: Wayne Morrison <6e4bcc1adc674293e0f7d4981be1a8c25520e9ec@netgate.com>

chrisy/vpp,FDio/vpp,FDio/vpp,FDio/vpp,FDio/vpp,FDio/vpp,FDio/vpp,chrisy/vpp,chrisy/vpp,chrisy/vpp,chrisy/vpp,chrisy/vpp,FDio/vpp,FDio/vpp,chrisy/vpp,chrisy/vpp